Question 1

How do I calculate a percentage?

Accepted Answer

Part/Whole × 100. What percent is 30 of 120? 30/120 × 100 = 25%. To find part: Whole × Percent/100.

Question 2

What is 15% of 200?

Accepted Answer

200 × 0.15 = 30. Or: 200 × 15 ÷ 100 = 30. Quick tip: 10% is 20, half of that (5%) is 10, so 15% = 30.

Question 3

How accurate are these calculations?

Accepted Answer

Our calculator uses double-precision floating-point arithmetic, accurate to about 15-16 significant digits for most calculations.

Question 4

Can I use the result in further calculations?

Accepted Answer

Yes, results are calculated to full precision. You can copy the exact value or use the rounded display depending on your needs.

Percentage Calculator - Free Online Tool

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